# Jan Kostrzak

> Polish historian and diplomat (1946-2004)

**Wikidata**: [Q71270214](https://www.wikidata.org/wiki/Q71270214)  
**Source**: https://4ort.xyz/entity/jan-kostrzak


## References

1. Czech National Authority Database
2. [Source](https://nauka-polska.pl/#/profile/scientist?id=47291)
3. Virtual International Authority File